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Only motor listed below whose speed increases with increase in armature current is ___________

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Only motor listed below whose speed increases with increase in armature current is ___________

(a) DC series motor

(b) DC cumulative compound motor

(c) DC shunt motor

(d) DC differential compound motor

I have been asked this question during an internship interview.

The above asked question is from Operating Characteristics of DC Compound Motor in portion Characteristics of DC Motors of DC Machines

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Correct answer is (d) DC differential compound motor

Easiest explanation: Shunt motor speed though decreases by slight value as armature current increases, it is assumed to be constant. But series motor and cumulative motor speed decreases as armature current increases. Only differential motor flux reduces with increase in armature current thus, speed increases.

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